CASE REPORT Ann Clin Neurophysiol 2020;22(2):125-128 https://doi.org/10.14253/acn.2020.22.2.125 ANNALS OF CLINICAL NEUROPHYSIOLOGY Focal eosinophilic myositis presenting with leg pain and tenderness Jin-Hong Shin1,2, Dae-Seong Kim1,2 1Department of Neurology, Research Institute for Convergence of Biomedical Research, Pusan National University Yangsan Hospital, Yangsan, Korea 2Department of Neurology, Pusan National University School of Medicine, Yangsan, Korea Focal eosinophilic myositis (FEM) is the most limited form of eosinophilic myositis that com- Received: September 11, 2020 monly affects the muscles of the lower leg without systemic manifestations. We report a Revised: September 29, 2020 patient with FEM who was studied by magnetic resonance imaging and muscle biopsy with Accepted: September 29, 2020 a review of the literature. Key words: Myositis; Eosinophils; Magnetic resonance imaging Correspondence to Dae-Seong Kim Eosinophilic myositis (EM) is defined as a group of idiopathic inflammatory myopathies Department of Neurology, Pusan National associated with peripheral and/or intramuscular eosinophilia.1 Focal eosinophilic myositis Univeristy School of Medicine, 20 Geu- mo-ro, Mulgeum-eup, Yangsan 50612, (FEM) is the most limited form of EM and is considered a benign disorder without systemic 2 Korea manifestations. Here, we report a patient with localized leg pain and tenderness who was Tel: +82-55-360-2450 diagnosed as FEM based on laboratory findings, magnetic resonance imaging (MRI), and Fax: +82-55-360-2152 muscle biopsy. E-mail:
[email protected] ORCID CASE Jin-Hong Shin https://orcid.org/0000-0002-5174-286X A 26-year-old otherwise healthy man visited our outpatient clinic with leg pain for Dae-Seong Kim 3 months.